Hydroxybenzoquinones from Myrsinaceae Plants. IV. Further Confirmation of the Structures of Ardisiaquinones and Some Observations on Alkylaminobenzoquinone Derivatives

Abstract

1, 16-bis (2, 5-Dimethylamino-p-benzoquinon-3-yl) hexadecane (II) was synthesized and proved to be identical with the tetrakis (methylamino) derivative prepared from dihydroardisiaquinone A (IX). The positions of methoxyl groups in ardisiaquinones (Ia-Ic) were confirmed by the examination of the nuclear Overhauser effect. Dealkylation was accompanied in alkylamination of VI and toluquinone. Some observations on nuclear magnetic resonance spectra of alkylaminobenzoquinone derivatives were also reported.